A roller coaster travels on a frictionless track as shown in the figure, with h

A roller coaster travels on a frictionless track as shown in the figure, with h = 7.8 m and v = 6.7 m/s.a)If the speed of the roller coaster at point A is 6.7 m/s, what is its speed at point B?b)Will it reach point C?c)What minimum speed at point A is required for the roller coaster to reach point C?

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